Metal Slug 4 is an online NEO-GEO game that you can play at Emulator Online. This free Neo Geo game is the United States of America region version for the USA. Metal Slug 4 is a single title from the many arcade games, action games and platform games offered for this console. If you enjoyed playing this, then you can find similar games in the neo-geo games category. Metal Slug 4 game is from the various retro games on the site, and there are more games like this, including Metal Slug, Metal Gear and Metal Gear Solid.